There are plenty of Adult based Alt-coins already. If you have an actual project, you may want to talk to one of the Dev's, as they may do what they can to help you out, since they haven't really hit the market very hard yet. One in particular would be Sexcoin. I think they might have a few Toy shops, a few Cam Girls, and a few Escorts accepting it, but other than that, they need a good market.
Aside from that, any other alt coin or even BTC would be happily accepted for any Adult project you have. I'm sure whatever project you have is not on the level of what is on TOR, and they all happily accept BTC.
Edit:
Oh wait, are you asking if a Crypto coin would accept being in an adult service industry, or are you asking if you think we think that the adult service industry could use a Token based cryptocurrency, and that you would try to create it. If that is the case, it's been done before, and hasn't have much traction yet.
I am not willing to create just a coin to pay for everything. Token will be just a part of all the platform. Sexcoin offers literally nothing (at least I didn't find anything good about it). The thing what I am asking to the community is - does the adult category fits/is interesting/etc to crypto users. I don't have doubts about the platform I am willing to build (because it has proved to be success without blockchain and with improvements i can make - it should be 2x success) but I have doubts about the category itself and if it fits the crypto world.